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From c913861c81772b42b5a5279d035430f11dc8a790 Mon Sep 17 00:00:00 2001
From: Oliver Reiche <oliver.reiche@huawei.com>
Date: Fri, 4 Aug 2023 17:57:20 +0200
Subject: [PATCH] config.guess: Detect glibc via __GLIBC__
Backport from GCC 11.1.0
Git commit: 53a90650663e59948f86505660604b5769cf808c and
74af13c174714dd3b9f1ded4b39955f003c16361
Co-authored-by: Iain Sandoe <iain@sandoe.co.uk>
Co-authored-by: Kito Cheng <kito.cheng@sifive.com>
---
config.guess | 28 +++++++++++++++++++---------
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/config.guess b/config.guess
index 97ad073..8792dd3 100755
--- a/config.guess
+++ b/config.guess
@@ -136,9 +136,7 @@ UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown
case "$UNAME_SYSTEM" in
Linux|GNU|GNU/*)
- # If the system lacks a compiler, then just pick glibc.
- # We could probably try harder.
- LIBC=gnu
+ LIBC=unknown
set_cc_for_build
cat <<-EOF > "$dummy.c"
@@ -147,17 +145,29 @@ Linux|GNU|GNU/*)
LIBC=uclibc
#elif defined(__dietlibc__)
LIBC=dietlibc
- #else
+ #elif defined(__GLIBC__)
LIBC=gnu
+ #else
+ #include <stdarg.h>
+ /* First heuristic to detect musl libc. */
+ #ifdef __DEFINED_va_list
+ LIBC=musl
+ #endif
#endif
EOF
eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
- # If ldd exists, use it to detect musl libc.
- if command -v ldd >/dev/null && \
- ldd --version 2>&1 | grep -q ^musl
- then
- LIBC=musl
+ # Second heuristic to detect musl libc.
+ if [ "$LIBC" = unknown ] &&
+ command -v ldd >/dev/null &&
+ ldd --version 2>&1 | grep -q ^musl; then
+ LIBC=musl
+ fi
+
+ # If the system lacks a compiler, then just pick glibc.
+ # We could probably try harder.
+ if [ "$LIBC" = unknown ]; then
+ LIBC=gnu
fi
;;
esac
--
2.30.2
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